Basic Qualification · B-003 Station assembly, practice and safety · B-003-014-005
What circuit causes a transmitter to automatically transmit when an operator speaks into its microphone?
- A VFO
- B VOX
- C VXO
- D VCO
Correct answer: B — VOX. From the official ISED question bank, verified word for word.
Why
VOX stands for voice-operated exchange, a circuit that senses your voice and flips the switch to transmit automatically so you do not need to press a button. The full explanation — and one for every question — is in Pro.
Practise this section
Building a station safely: power supplies, grounding, RF exposure, lightning, feedline routing, and what a transmitter, receiver and transceiver actually do.